A container weighs more after air is put in,_____ proves that air has weight. 

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• 1There is a mountain _____the top is always covered with snow. 

  A.whose

  B.of which

  C.its

  D.that 

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• 2. We would do more such exercises in the future, I think, ________ we did yesterday.

  A.as

  B.which

  C.that

  D.than

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• 3A new subway will have been completed in the city by the end of the year 2007 , ________ will be very convenient for us to get around shopping and sightseeing.

  A.when it

  B.where it

  C.when that

  D.which that

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• 4The reason ______he didn't come was ______he was ill.

  A.why; that

  B.that;why

  C.for that;that

  D.for which;what

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• 5Is _______ some German friends visited last week?

  A.this school

  B.this the school

  C.this school one

  D.this school where

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• 6In the office I never seem to have time until after 5:30 p. m., _____ many people have got home.

  A.whose time

  B.by that time

  C.on which

  D.by which time

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• 7_____several times，but unfortunately，the boy still couldn't smooth away the problem on his own.

  A.Having been explained

  B.The problem having been explained

  C.The problem had been explained

  D.Although the problem had been explained

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• 8________ is well-known to all, the great changes have taken place in Chin

  A.A.It

  B.that

  C.As

  D.Which

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• 9 So many uses have been discovered for this wood ________ the supply of white pine is becoming smaller and smaller.

  A.then

  B.what

  C.that

  D.which

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• 10Perseverance is a kind of quality and that's ________ it takes to do anything well.

  A.what

  B.that

  C.which

  D.why

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